Indicators
See page 3.
1
Signa! Strength Meter
The left hand meter provides a relative indication of the signal strength of a received signal in
S units during réception. Note that SSB signais w ill respond this meter only during voice modula
tion. This being due to the fact that SSB transmissions do not contain a continuous RF carrier
as is found on AM or FM.
2
RF Power/SWR Meter
Used for two purposes — to indicate relative transmitter power (4W or 0.5W AM/FM — selectable,
12W PEP SSB) when transmitting; to indicate the antenna SWR [standing wave ratio],
3
Channel Display
This is an LED [light emitting diode] digital readoutwhich indicates the channel selected by the
Channel Selector 11).
4
Function Indicators
The LED indicators located in this area permit you to know instantly the mode with which the
unit has been engaged.
Hi-CH:
Lights up when unit is operating in
FU
40 channels.
On A ir:
Lights up during transmit mode indicating you are on-the-air.
Modulation:
Lights up during transmitting with intensity varied according to the strength of your
voice modulation.
FM, AM, SSB:
Indicates a mode selected by the
Mode Selector 12).
Push-to-Talk
Microphone
The receiver and transmitter are controlled by the
Push-to-Talk
switch on the microphone. Press
the switch and the transmitter is activated; release the switch to receive. When transmitting, hold the
microphone two inches from the mouth and speak clearly in a normal voice. The radio cornes com
plété with the low impédance dynamie microphone supplied.
Optional:
TW232S table microphone.
Operating
Procedure
To Receive
Important: Make sure antenna, power source, and microphone are connected before you operate.
1 Turn the unit on by setting the
Power Switch 1)
to
On
position. Now the meters,
Channel
Display
and
Function Indicator
w ill be illuminated.
2 Temporarily, set the
Mode Selector 12)
in
A M
position.
3 Set the
Squelch Control 15)
in fuily counterclockwise position and adjust the
A F Gain contro
/
16)
for a comfortable listening level.
4 Listen to the background noise from the speaker. Turn the
Squelch Control 15)
slowly clockwise
until the noise just disappears (no signal should be present). Leave the
Squelch Control
at this
setting. The
Squelch Control
is now properly adjusted. The receiver will remain quiet until a
signal is actually received. Do not advance the
Squelch Control too far
clockwise
or
some
of
the
weaker signais w ill not be heard.
5 Set Tune and Clarifier in the pushed and center position respectively.
6 Select a desired mode of operation, FM, AM, SSB, or, USB. Adjust
Clarifier 17) for
advanced
operation.
To Receive
1 Select the desired channel and mode of transmission.
2 If the channel is elear, depress the
Push-to-Talk
switch on the microphone. Speak in a normal
tone of voice.
SWR Check
Though most antennas are factory-tuned, adjusting the length of antenna using the SWR meter may
peak the antenna efficiency and protect the final RF power transistors from an overload due to
mismatch. Proceed as follows:
1 Set the unit in the receive mode as instructed under the Operating Procedure to Receive section.
2 Set the Mode switch 12) to AM position; the SWR-Cal 6) switch to the Cal position.
3 Pressing the Push-to-Talk switch on the microphone and turn the Calibrate Control 7) clockwise
(past dick) so that the SWR meter pointer exactly coincides with the Set mark on the scale.
Release the Push-to-Talk switch.
4 Set the SWR-Cal switch to the SWR position and depress the Push-to-Talk switch again. The SWR
of your antenna is read directly on the scale. An SWR below 2 or less is desired as this indicates
that over 95% of the transmitted power is broadeast into the air.
7
